Rear Oxygen Sensor: Installation

CAUTION: If lubricant is spilt over the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.

Before installing rear oxygen sensor, apply the anti-seize compound only to the threaded portion of rear oxygen sensor to make the next removal easier.
CAUTION: Never apply anti-seize compound to the protector of rear oxygen sensor.

Anti-seize compound: NEVER-SEEZ NSN, JET LUBE SS-30 or equivalent
Install the rear oxygen sensor.
Tightening torque: 21 N.m (2.1 kgf-m, 15.5 ft-lb)

Fig 1: Identifying Front Oxygen (A/F) Sensor And Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Install the under cover. Ref. to INSTALLATION , Front Under Cover.
Lower the vehicle.
Connect the rear oxygen sensor connector (B) and fasten the harness with clips (C).

Fig 2: Identifying Front Oxygen (A/F) Sensor Connector, Rear Oxygen Sensor Connector And Harness Clip
Courtesy of SUBARU OF AMERICA, INC.
Install the air intake duct. Ref. to REMOVAL , Air Intake Duct.
Connect the ground cable to battery.

Fig 3: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.